I’ve had my March pump for ~8 years now and never had any major issues with it. I run it on my custom 15 gal RIM system. Then two batches ago it started acting up towards the end. It does this thing where I turn it on, it starts and then within one second I hear it make a noise like it dips in power and then it basically acts like it’s lost prime and stops pumping. It happened at the end of a batch so I just moved some stuff around and (slowly) chilled through gravity feed. I tested it out with room temperature water a few days before my next brew and it worked fine for 10 min+ so I didn’t attempt to fix anything.
I brewed yesterday and it started acting up a little during recirc. It would do it’s weird thing about once every five minutes. Then I went to finish up and chill and same thing as last time–it would dip and lose prime after just a second.
I’ve heard of people replacing the impeller in these and it looks straight forward. I could do that but was wondering if anyone else has experienced something like this before I start dismantling. It’s attached to some hard piping that would be a semi-pain to remove. The problem almost acts like it’s an issue with the motor but it seems greatly influenced by fluid temperature.